John A. Catsimatidis is an American billionaire businessman and radio talk show host. He is the owner, president, chairman, and CEO of Gristedes Foods, the largest grocery chain in Manhattan, and the Red Apple Group, a real estate and aviation company with about $2 billion in holdings in New York, Florida and Pennsylvania. He is also the chairman and CEO of the Red Apple Group subsidiary United Refining Company. He hosts a Sunday morning talk-radio show on a number of stations along the east coast and Florida, including Washington DC, and hosts a live radio program which airs Wednesdays during drive time in the New York City metro area. Catsimatidis was the runner-up to the Republican nomination for mayor of New York City in the 2013 election.